- All patients should have their tumor tissue tested for HPV (in situ hybridization and/or p16 staining by immunohistochemistry), and results must be known prior to study entry, and will consent to have available archival tumor samples, unstained slides or blocks from previous diagnostic or therapeutic procedures submitted for correlative studies, including assessment of target molecules EGFR, VEGF and related biomarkers. Also, patients must agree to submit blood samples for correlative studies at least at baseline.